Ten Vegetable Diseases You Can Learn to Hate (or Love)
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1 Juneau County Seminar You Can Learn to Hate (or Love) Brian D. Hudelson Department of Plant Pathology University of Wisconsin-Madison/Extension Septoria lycopersici (Septoria leaf spot) Alternaria solani (early blight) Phytophthora infestans (late blight) Tomato Potato (early blight, late blight) Favorable environment: Cool, wet weather (early blight, Septoria leaf spot) Remove and destroy infested debris (burn, bury, hot compost) Move tomatoes to new location (?) Plant resistant varieties (?) Space plants far apart Mulch around the base of plants DO NOT over-mulch (early blight, Septoria leaf spot) DO NOT overhead water Remove infected leaf tissue (?) Use fungicides to prevent infections Chlorothalonil, mancozeb Alternate active ingredients (FRAC codes) Apply at 7-14 days intervals 1
2 (late blight) Remove and destroy Infected plants, fruits, tubers Volunteer tomato and potato plants Weed hosts DO NOT use last year s potatoes as seed potatoes DO use certified seed potatoes (late blight) Grow resistant tomato varieties Late Blight Management in Tomato with Resistant Varieties (late blight) Use fungicides to prevent infections Chlorothalonil, mancozeb Alternate active ingredients (FRAC codes) Start applications based on Blitecast ( Apply at 7-14 day intervals Bacterial Tomato Diseases Pseudomonas syringae pv. tomato (bacterial speck) Xanthomonas spp. (bacterial spot) Host: Tomato Favorable environment Cool, wet weather (bacterial speck) Warm, wet weather (bacterial spot) Bacterial Tomato Diseases Dispose of contaminated plant debris (burn, bury, hot compost) Remove and destroy volunteer tomatoes Start with pathogen-free seeds and plants Hot water treat seeds (122 F, 25 minutes) Move tomatoes to new location Space plants far apart 2
3 Bacterial Tomato Diseases Mulch around the base of plants DO NOT over-mulch DO NOT overhead water DO NOT handle plants when wet Use bactericides to prevent infections Apply at 7-14 days intervals Tolerant bacterial strains are a problem Blossom End Rot Cause: Calcium deficiency Affected plants Tomato Pepper Eggplant Cucurbits (cucumber, squash, pumpkin) Environmental trigger: Drought Blossom End Rot Test soil to determine calcium level Add calcium as needed Bone meal Egg shells NOT lime (usually) Water plants adequately and uniformly Walnut Toxicity Cause: Juglones Black walnut Butternut Hickory Affected plants Many vegetables Asparagus, cabbage Tomato, potato, pepper, eggplant 3
4 Walnut Toxicity DO NOT plant sensitive vegetables near walnut trees Plant tolerant vegetables Beans Beet Carrot Corn Melon Onion Parsnip Squash Plant sensitive vegetables in raised beds in pots Walnut Toxicity Keep walnut leaves and fruits out of your garden DO NOT compost walnut leaves and fruits Remove volunteer walnut trees Remove mature walnut trees (?) Herbicide Injury Growth regulator herbicides 2,4-D Dicamba Other herbicides Affected plants All vegetables Tomatoes Herbicide Injury DO NOT use herbicides If you or your neighbors do use herbicides, make sure that you or they Follow application directions exactly Apply herbicides at low wind speeds (< 5 mph) DO NOT apply herbicides too close to sensitive plants Apply herbicides at low pressure Use amine rather than ester forms of herbicides Powdery Mildew Miscellaneous powdery mildew fungi Oidium spp. Cucurbits (cucumber, squash, pumpkin) Other vegetables (pea, tomato) Environmental trigger: High humidity 4
5 Powdery Mildew Plant resistant varieties (where available) DO NOT crowd plants Thin plants Grow vining plants on a trellis Powdery Mildew Use fungicides to prevent infections Dithiocarbamates, myclobutanil, propiconazole, tebuconazole, thiophanate-methyl Sulfur, neem oil, other plant-based oils 1.5 Tbsp baking soda + 3 Tbsp light-weight horticultural oil in 1 gal water Alternate active ingredients (FRAC codes) Apply when humidity is >60-70% Apply every 7-14 days Aster Yellows Cause: Aster yellows phytoplasma Carrot Potato Other vegetables Environmental trigger: None Transmission: Aster leafhopper Aster Yellows Remove infected plants Use insecticides to control leafhoppers 5
6 Cause: Xanthomonas campestris pv. campestris : Crucifers Brussels sprouts, cabbage, collards Broccoli, cauliflower, kale, kohlrabi, rutabaga, turnips Environmental trigger: Wet weather Buy high quality (certified pathogen-free) seed or transplants Heat treat seeds 35 min, 122 F (Brussels sprouts, cabbage, collards) 20 min, 122 F (broccoli, cauliflower, kale, kohlrabi, rutabaga, turnips) Routinely rotate crops DO NOT grow host plants in an infested areas Plant non-hosts in infested areas Fertilize properly (particularly nitrogen) DO NOT overhead water DO NOT handle plants when wet Remove and dispose of contaminated plants (burn, bury, hot compost) Decontaminate infested items 10% bleach 70% alcohol Commercial disinfectants Use bactericides to prevent infections Apply at 7-14 days intervals Tolerant bacterial strains are a problem Common Scab Cause: Streptomyces scabies Potato Carrot Other root crops Environmental trigger: High soil ph 6
7 Common Scab Plant scab-free potato stock Routinely rotate crops DO NOT grow host plants in an infested areas Plant non-hosts in infested areas Move potatoes to another location Plant scab resistant varieties Lower soil ph DO NOT use chemical or biological controls Common Smut Cause: Ustilago maydis Host: Sweet corn Environmental trigger None (ear infections) Hail (leaf and stalk infections) Common Smut Plant resistant varieties Reduce physical damage to corn plants DO NOT use chemical or biological controls Give up on your corn and eat the smut (huitlacoche) Where to Go for Help Plant Disease Diagnostics Clinic Department of Plant Pathology University of Wisconsin-Madison 1630 Linden Drive Madison, WI (608) Follow on Facebook and 7
Diseases of Vegetables
Garden Expo 2018 Brian D. Hudelson Department of Plant Pathology University of Wisconsin-Madison/Extension Causes Septoria lycopersici (Septoria leaf spot) Alternaria solani (early blight) Phytophthora
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